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Wiring FSL Detectors

Each FSL zone is a ‘Fully Supervised Loop’ using a two wire closed loop. The

loop uses two resistors of different values to differentiate between ‘Circuit’

and ‘Tamper’ signals: a 2K2 (2.2KΩ) resistor fitted in series at the end of the

wired loop (EOL-End-Of-Line), and a 4K7 (4.7KΩ) resistor fitted across the

alarm contact, see Figure 6.

Figure 6. Connections for Single Alarm Contacts and Tamper Wiring.

Wiring External Sounders

Figure 7 shows the connections for a typical external sounder (SAB). O/P1 is

permanently programmed as a Bell output. Use Menu 51 in Installer pro-

gramming mode to select normally energised or normally de-energised, and

to program a Strobe output.

If the cable to the external sounder is longer than 50m then some makes of

sounder may cause a tamper when activated. To overcome this problem

double up the wires between the -ve Hold Off on the sounder and the Aux -ve

connection on the panel. If more than one external sounder is being con-

nected, then consult the sounder manufacturer on how to wire the tamper

return circuit.

Figure 7. External/Internal Sounder Connection

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